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topic 8042

Material of Construction for Anodize Strip Tank (phosphoric/chromic acid)


Can anodize stripping solution, i.e., phosphoric/chromium trioxide be used in a stainless steel tank for heating and stripping, or should it be stored and used in a plastic vessel/tank?

Kind regards

Steve Power
anodizing shop - Nelson, Australia


I would go with the stainless tank on this one..I believe 316L is recommended, the plastic tank would have to be heavily reinforced due to the temperature of the chrome/phosphoric mixture.

Marc Green
Marc Green
anodizer - Boise, Idaho



The ignoranti, such as myself, could far easier answer your question if we but knew the temperature of the mix ... and also the tank size/capacity would be a useful guide.

Marc is maybe 100% right in promoting a stainless tank as he is more aware than I am of the temperatures.

But here's a guide on the dual laminates, ie. professionally made fiberglass reinforced armored thermoplastics based on max. service temperature for pipe @ around 100 psi. However, I'd play safe and NOT weld on any outlets but use tank adaptors as I think that you might get stress cracking around the welds of PE and also with PP.

Cheers (and where the heck is Nelson in Oz?)

PVC 80 °C
PP 80 PVDF 140
FEP 200 one of the weldable fluorocarbons

You might try the 'local' manufacturer (Engel process) of rotationally molded Poly tanks. They should be good for a max. temp. of 150 °F ... and if rectangular (we have them to 500 imp gals in Canada) they can 'bow' so they'd need some horizontal stiffeners (wood, metal, whatever).

freeman newton portrait
Freeman Newton [dec.]
White Rock, British Columbia, Canada

(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).

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